diff -r a616540b95d9 -r 99b535de1dda extras/calcsoft/src/CalcDoc.cpp
--- a/extras/calcsoft/src/CalcDoc.cpp	Wed Jun 09 09:43:27 2010 +0300
+++ b/extras/calcsoft/src/CalcDoc.cpp	Mon Jun 21 15:42:09 2010 +0300
@@ -265,6 +265,10 @@
         case  TCalcEditLine::ECalcAdd:
             {
             result += aOperand;
+            if( Abs(result)<= KCalcDefaultZero )
+            	{
+            	result = 0;
+            	}
             break;
             }
         case  TCalcEditLine::ECalcSubtract: